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I must agree. I think it sounds like a layer 1 or layer 2 problem. Swap out the cables on both PCs and see if the performance improves on the transfer.

Most of the time if the duplex setting and tranfer rates are set to auto they will negotiate the most optimal settings. Is there a delay when you ping between that machines? I mean outside of the normal LAN delay?

How many protocols do you have bound to the card? In most cases it should just be TCP/IP, but I have seen problems where people had Appletalk, IPX/SPX, TCP/IP and every thing else under the sun. Additional traffic from these protocols may cause delay.

Let me know the above info and ill see what else I can think of.

\"Common Sense, isn\'t that common\" \"It is a lot easier to raise a child then it is to repair an adult\"
-Kruptos

In application 100Fdx is going to be the fastest you can get if it works. Did you look at any of the things i mentioned earlier?

You should be able to make the changes on the fly and not need to reboot anything. Newer routers are usually auto-sensing when it comes to the line speed and it may not be there in the GUI as a setting. If you really think that you need to change it on the router you may be able to make changes via commandline/telnet.

Alos, how did the output look from the netstat -se command? lots of errors?

\"Common Sense, isn\'t that common\" \"It is a lot easier to raise a child then it is to repair an adult\"
-Kruptos

I dont remember if it was mentioned but you can take a crossover cable and directly connect the 2 PCs together and transfer the files.

Obviously this is not the long term solution but it will rule out if it is a problem with the router or not.

Directly connect the 2 PCs with the crossover cable, try to transfer the files and see if there is any difference. If the problem goes away it may be your router, if the problem persists then it is most likely a PC to PC issue.

Let me know what happens :-)

\"Common Sense, isn\'t that common\" \"It is a lot easier to raise a child then it is to repair an adult\"
-Kruptos

The full duplex just means its using one pair for transmit and one pair for receive so in theory no collisions and better performance. Hooking the two pc's together with a cross-over will force the connection to be half duplex, which will hurt performance since they will have to share the same pair for transmit/receive.

In my experience, using netbios to transfer files has always been hideously inefficient. Perhaps you could setup IIS on one of the two servers and enable FTP for a bit (make sure you setup directory security so that its only available on the local LAN from the other system). In the past, this is usually what I'd do to transfer a large amount of files since it was a little more effecient at sending the data. You could also accomplish the same thing with netcat or if you were worried about encrypting the sessions, could perhaps setup SSH or cryptcat...

Just a thought, but IMHO, your performance issues lay more with the protocol than anything else...

There is only one constant, one universal, it is the only real truth: causality. Action. Reaction. Cause and effect...There is no escape from it, we are forever slaves to it. Our only hope, our only peace is to understand it, to understand the 'why'. 'Why' is what separates us from them, you from me. 'Why' is the only real social power, without it you are powerless.